锰
材料科学
阴极
锂(药物)
过渡金属
金属
化学工程
纳米技术
化学
物理化学
催化作用
冶金
工程类
医学
生物化学
内分泌学
作者
Fei Cao,Weihao Zeng,Jiawei Zhu,Jinsheng Xiao,Zilan Li,Ming Li,Rui Qin,Tingting Wang,Junxin Chen,Xiaoli Yi,Jiexi Wang,Shichun Mu
出处
期刊:Small
[Wiley]
日期:2022-05-12
卷期号:18 (24)
被引量:16
标识
DOI:10.1002/smll.202200713
摘要
Owing to the interacted anion and cation redox dynamics in Li2 MnO3 , the high energy density can be obtained for lithium-rich manganese-based layered transition metal (TM) oxide [Li1.2 Ni0.2 Mn0.6 O2 , LNMO]. However, irreversible migration of Mn ions and oxygen release during highly de-lithiation can destroy its layered structure, leading to voltage and capacity decline. Herein, non-TM antimony (Sb) is pinned to the TM layer of LNMO by a facile sol-gel method. High-resolution ex and in situ characterization technologies manifest that the introduction of trace Sb inhibits the migration of Mn ions, forming a more stable structure. Sb can impressively adjust the Mn-O interaction between anions and cations, beneficial to decrease the energy level of Mn 3d and O 2p orbitals and expand their band gap according to the theoretical calculation results. As a result, the discharge specific capacity and the energy density for SbLi1.2 [Ni0.2 Mn0.6 ]O2 (SLNMO) reaches as high as 301 mAh g-1 and 1019.6 Wh kg-1 at 0.1 C, respectively. Moreover, the voltage decay is reduced by 419.8 mV compared with LNMO. The regulative interaction between Mn 3d and isolated O 2p bands provides an accurate guidance for solving electrochemical performance deficiencies of lithium-rich manganese-based cathode oxide.
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